Fuse-plug.



' T. E. MURRAY.

FUSE PLUG.

APPLIQATION FILED JULY 24, 191s.

Patented Dec. 2, 1913.

f j@ fm THOMAS E. MURRAY, OF NEW YORK, N. Y.

FUSE-PLUG.

Specification of Letters Patent.

Patented Dec. 2,1913.

Application inea July 24, 1913. serial No. 780,857.

T0 all whom it may concern Be it known that I, THOMAS E. MURRAY, a citizen of the United States, residing'at New York, inthe county of New York and State ofNew York, have invented a certain new and useful Improvement in Fuse-Plugs, of which the followin is a specification.

`The invention is a use plug, and -consists in the construction, more particularly hereinafter pointed out, whereby the device may be cheaply made of few and easily assembled parts.

In the accompanying drawings Figure l is a longitudinal section of my fuse plug on the line im, 0c of Fig. 2. Fig. 2 is a side elevation. Fig. 3 is a bottom' view. Fig. t is my plug on the line y, y of Fig. 5.

a longitudinal sectionio'f a modified form of Fig. 5 is a`side elevation of the form shown in Fig. 4, a portionbeing broken away and in section.

Similar letters. of reference indicate like parts. I

vA is the cylindrical casing of insulating material externally threadedand open at one end. In the other and c'losed end is a central sight-opening B..

C is a threaded metallic shell receiving the threaded ortion of casing `A, and havin an inwardly turned flange D.

is a disk of insulating material closing the open` end of casing A. Within' said casing and supported on said disk is a parti# tion' F of Vinsulating material.

G is a fuse strip doubled at its middle portion over partition 'F and having one end H doubled over the edge of disk E. The

other end I of strip G extends through disk E and is bent over on the outer side thereof. In order to protect the exposed portion of end I, a strip J of copper is inserted in disk E and bent over to cover said exposed portion. -v`Within the casing A and just below the sight-opening B isa disk K of mica. `In assembling the parts, the fuse strip G and copper strip J are first put in place, as described, on the. disk E, and said disk is v.seated 'upon the flange D of shell C. The

casing A is then screwed intoshell C, thus clamping the end Hof the fuse between the l ang'e D and disk E and between disk E and casing A.

In the modified form shown in Figs. 4 and 5, the partition F extends vthrough the disk E, and carries outside of said disk a-washer L of insulating material. i One end ofthe the washer L and is doubled on itself, as

shown at M, so as to Aform a flat contact plate resting agaillst the outer edge of partition l".r The other end N of the fuse strip is bent to pass between washer L and disk E. In assembling this form, the fuse strip G is put in place and with its ends projectillg outwardly from disk E and parallel to one another. Disk E is tllen inserted in shell C so as torest on flange D. Casing A is screwed into shell C, thus clamping disk E in place. End N of strip G being bent over as sllown, the washer L is applied. Finally, the end of the fuse strip/which passes through disk E and washer L is doubled over o-utside of the washer to form the contact plate M. i

\I claim: a

Il A fuse plug, comprising a hollow cylindrical tllreaded casing, a threaded shell recelving said casing and having an inwardly turned flange, a disk of insulating material interposed between the end of said casing and the flange of said shell, a partition entering said casing and supported on said disk, and a fuse strip doubled over said partition and having one end connected to said shell and the other end extending through said disk.

2. A fuse plug, comprising a hollow cylin- .f .lrical threaded easing, a threaded shell receiving said casing and having an inwardly turned flange, a disk of insulating material interposed between the end of said casingl 'and the flange of said shell, a partition en? tering said easing and supported on said disk, and a fuse strip doubled over said partition and having one end doubled over the edge of said disk and in contact with said shell and the other end extending through said disk. y

3. A fuse plug, comprising a hollow cylindrical threaded casing, a threaded shell recelving said casing and having an inwardly turned flange, a disk of insulating material interposed between the end of said casing and the flange of said shell, a partition entering said easing and extending through said disk, a fuse strip doubled over said partition and -having' one end connected to said shell, and an insulating washer on said Ipal"- ltition outside of said disk; thefremainingA end4 of fuse strip extending lthrong said disk and washer. 4 'f .4. A fuse plug, comprising a hollow cylindrical threaded casing, a threaded shell receivlng said oasingiand having an linwardly turned flange, a disk of insulating materlal vinterposed between the end of said casing and the flange of said shell, a partition entering said casing and extending through 4said disk, a fuse strip doubled over said partition and having one end connecvtedftosaid shell, and an insulating washer on said 10 partition outside of said disk; the remaining THOMAS E. MURRAY.

` Witnesses `GrERTRUDE T. PORTER,

MAY T. MCGAimY.

Copies of lthis patent may be obtained for vc cents each, by addressing` the Commissioner of Patents,

' Washington, D. C. 

